diff --git a/README.md b/README.md
index 7cbd0e8..4893418 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,7 @@ java2js can translate simple Java programs to JavaScript and runs them using a J
 The java2js transpiler supports:
 
 - imports
+- primitive type casting
 - static classes
 - static methods
 - array literals
@@ -54,26 +55,26 @@ The java2js transpiler supports:
 
 This function imports the standard java.lang classes into the global scope. You must use it before translating or running files.
 
-- root (optional) path to the JS JDK folder, by default it is `./jdk` (the java2js JS JDK), for online use on codepen or similar code sharing sites you can use this link as the root path: 'https://unpkg.com/java2js/jdk'
+- root: (optional) path to the JS JDK folder, by default it is `./jdk` (the java2js JS JDK), for online use on codepen or similar code sharing sites you can use this link as the root path: 'https://unpkg.com/java2js/jdk'
 
 ### await jdk.transpile(javaFile)
 
 Translates a Java class and loads it.
 
-- javaFile is a String with a Java class in it
+- javaFile: a String with a Java class in it
 
 returns a String with the JavaScript transpilation of the Java class
 
 ### jdk.run(jvmArgs)
 
-Runs the main method with optional JVM arguments.
+Runs the main method
+
+- jvmArgs: (optional) String array of JVM arguments.
 
 ## Known limitations
 
 - not very good error reporting
 
-- casting to int (truncation) requires parenthesis around the number being cast `int x = (int) (Math.random() * 100);`
-
 - no support for method overloading, though a workaround might be possible by making a function with the og name route to each of the variations of the overloaded function
 
 - no support for private/public methods yet, though this could be done since they are included in modern JavaScript classes
diff --git a/docs/index.html b/docs/index.html
index 1a6282d..1361944 100755
--- a/docs/index.html
+++ b/docs/index.html
@@ -3,7 +3,7 @@
 	<head>
 		<meta charset="utf-8" />
 		<link rel="icon" type="image/x-icon" href="./favicon.ico" />
-		<title>java2js test</title>
+		<title>java2js demo</title>
 		<style>
 			body,
 			textarea {
@@ -29,7 +29,9 @@
 			p {
 				width: inherit;
 				text-align: center;
-				font-size: 2vw;
+				font-size: 3vh;
+				margin-top: 1vh;
+				margin-bottom: 1vh;
 			}
 
 			#javaFile {
@@ -55,21 +57,21 @@
 			placeholder="Create a Java class with a main method here..."
 		></textarea>
 		<div class="mid" onclick="location.href = 'https:\/\/github.com/quinton-ashley/java2js';">
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>j</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>a</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>v</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>a</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>2</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>j</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 			<p>s</p>
-			<img src="favicon.ico" alt="" />
+			<img src="favicon.ico" />
 		</div>
 		<textarea
 			id="javaConsole"
diff --git a/jdk.js b/jdk.js
index 73938f9..b5295ea 100755
--- a/jdk.js
+++ b/jdk.js
@@ -219,7 +219,7 @@
 						});
 
 						// cast to int, truncates the number (just removes decimal value)
-						file = file.replace(/\(int\)\s*/gm, 'Math.floor');
+						// file = file.replace(/\(int\)\s*/gm, 'Math.floor');
 
 						let packageName = (file.match(/package\s+([^;]+)/gm) || [])[1] || 'default';
 
@@ -265,6 +265,7 @@
 							await jdk.imports[`${packageName}.${className}`].load();
 						} catch (ror) {
 							console.error('Failed to load class!\n' + trans);
+							System.err.println('ERROR: Failed to load class');
 							return;
 						}
 
@@ -19167,14 +19168,44 @@
 									return expr.escapedValue.replace(/'/g, "\\'").replace(/"/g, "'");
 								case 'CharacterLiteral':
 									const char = expr.escapedValue.slice(1, -1);
-									// qashto: they were converting char to number here, no clue why??
 									if (char.length === 1) return "'" + char + "'";
 									else if (char.startsWith('\\u')) return parseInt(char.substring(2), 16).toString();
 									else return unhandledNode(expr, 'Weird char: ' + char);
-								// return expr.escapedValue.charCodeAt(1).toString(); // equivalent to: `'z'.charCodeAt(0)`
 								case 'CastExpression':
-									// TODO: use expr.type to convert?
-									return parseExpr(expr.expression);
+									let exp = parseExpr(expr.expression);
+									let type;
+									if (expr.expression.node == 'SimpleName') {
+										type = variableTypes[expr.expression.identifier];
+									} else if (expr.expression.node == 'CharacterLiteral') {
+										type = 'char';
+									} else if (expr.expression.node == 'NumberLiteral') {
+										type = 'double';
+									} else if (expr.expression.node == 'StringLiteral') {
+										type = 'String';
+									}
+									let castError = false;
+									let cast = expr.type.primitiveTypeCode;
+									if (cast == 'int') {
+										// if cast to int
+										if (type == 'char') {
+											exp += '.charCodeAt(0)';
+										} else if (/(double|float|short|long)/.test(type)) {
+											exp = 'Math.floor(' + exp + ')';
+										} else {
+											castError = true;
+										}
+									} else if (cast == 'char') {
+										if (/(double|float|short|long)/.test(type)) {
+											exp = 'String.fromCharCode(' + exp + ')';
+										} else {
+											castError = true;
+										}
+									}
+									if (castError) {
+										System.err.println(`error: incompatible types: ${type} cannot be converted to ${cast}: ${exp}`);
+										return '';
+									}
+									return exp;
 								case 'ConditionalExpression':
 									return `${parseExpr(expr.expression)} ? ${parseExpr(expr.thenExpression)} : ${parseExpr(
 										expr.elseExpression
diff --git a/jdk/java/lang/System.js b/jdk/java/lang/System.js
index d7d4426..9eccb90 100755
--- a/jdk/java/lang/System.js
+++ b/jdk/java/lang/System.js
@@ -7,6 +7,7 @@ jdk.imports['java.lang.System'].load = async () => {
 
 	System.in = new InputStream();
 	System.out = new PrintStream();
+	System.err = System.out;
 	System.out.onPrint = (length) => {
 		System.in.mark += length;
 	};
diff --git a/package.json b/package.json
index 013a56a..d490e89 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "java2js",
-	"version": "1.2.0",
+	"version": "1.2.1",
 	"description": "Converts Java to JavaScript and runs it with a JS JDK",
 	"main": "jdk.js",
 	"scripts": {
